Electronic apparatus for biological research Electronic apparatus for biological research . electronicappara00dona Year: 1958 DIODE CIRCUITS that it is desired to rectify a certain voltage V, and current, 0-/max, we have: minimum load resistance i^^min which will be connected = K//niax- Work out the optimum inductance from L = 7?2,min/470, finding a swinging choke whose inductance is this at maximum current /max- To load Figure Find the inductance of the swinging choke at low values of current from the makers' characteristics or by experiment, and call this L'. Work out the maximum pe
Electronic apparatus for biological research Electronic apparatus for biological research . electronicappara00dona Year: 1958 DIODE CIRCUITS that it is desired to rectify a certain voltage V, and current, 0-/max, we have: minimum load resistance i^^min which will be connected = K//niax- Work out the optimum inductance from L = 7?2,min/470, finding a swinging choke whose inductance is this at maximum current /max- To load Figure Find the inductance of the swinging choke at low values of current from the makers' characteristics or by experiment, and call this L'. Work out the maximum permissible bleeder resistance i?^, from L' — RJ940. VOLTAGE MULTIPLIER RECTIFYING CIRCUITS A number of pieces of apparatus in electronics, such as Geiger tubes and cathode ray tubes, require supplies of very low direct current and rather high voltage, say more than 1,500 volts. It is possible to derive such suppHes by conventional rectification of the output of a special high-voltage secondary winding on the power transformer, but often inconvenient. If lower alter- nating voltage supplies are available it is possible to generate the necessary high-voltage required by special 'voltage multiplier' circuits. Since the currents to be supplied are small these circuits are elaborations of the simple capacitance-input half-wave circuit already described, and their regulation is therefore poor. Somewhat simplified descriptions of these circuits and their operation will now be given. Symmetrical voltage doubler {Figure )—When terminal A of the genera- tor is positive with respect to terminal B current flows in the upper part of l^out=2V
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